how do i validate this - radio button

[ZUWARI]

it works but....

this is my full function:

for (Count = 0; Count < 2; Count++)
{
if (document.frm.frmHakMlk.checked)
{}
else
{
alert ("Please choose your option");
return false;
}

}

but when i click one of the radio button the result is still the same.
it seem that when the user choose the radio button, the function cannot read it. even can't test it! what happend?